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authorDaniel Mack <zonque@gmail.com>2012-07-25 22:54:29 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-08-16 10:02:33 -0700
commitd2323cf77308d6aa13a3a5287310ef93c4919d1e (patch)
treedf5fa99b5a9376386ed8deb842da90277f5cef53 /drivers/w1
parent5f3d1382e3ca39a54032784414f0ad4e7078b37e (diff)
downloadlinux-d2323cf77308d6aa13a3a5287310ef93c4919d1e.tar.gz
onewire: w1-gpio: add ext_pullup_enable pin in platform data
In the process of porting boards to devicetree implemenation, we should keep information about external circuitry where they belong - the individual drivers. This patch adds a way to specify a GPIO to drive the (optional) external pull-up logic, rather than using a function pointer for that. Signed-off-by: Daniel Mack <zonque@gmail.com> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Acked-by: Ville Syrjälä <syrjala@sci.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/masters/w1-gpio.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
index f01c336233d..6012c4ea320 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -104,6 +104,13 @@ static int __init w1_gpio_probe(struct platform_device *pdev)
if (err)
goto free_master;
+ if (gpio_is_valid(pdata->ext_pullup_enable_pin)) {
+ err = gpio_request_one(pdata->ext_pullup_enable_pin,
+ GPIOF_INIT_LOW, "w1 pullup");
+ if (err < 0)
+ goto free_gpio;
+ }
+
master->data = pdata;
master->read_bit = w1_gpio_read_bit;
@@ -117,15 +124,21 @@ static int __init w1_gpio_probe(struct platform_device *pdev)
err = w1_add_master_device(master);
if (err)
- goto free_gpio;
+ goto free_gpio_ext_pu;
if (pdata->enable_external_pullup)
pdata->enable_external_pullup(1);
+ if (gpio_is_valid(pdata->ext_pullup_enable_pin))
+ gpio_set_value(pdata->ext_pullup_enable_pin, 1);
+
platform_set_drvdata(pdev, master);
return 0;
+ free_gpio_ext_pu:
+ if (gpio_is_valid(pdata->ext_pullup_enable_pin))
+ gpio_free(pdata->ext_pullup_enable_pin);
free_gpio:
gpio_free(pdata->pin);
free_master:
@@ -142,6 +155,9 @@ static int __exit w1_gpio_remove(struct platform_device *pdev)
if (pdata->enable_external_pullup)
pdata->enable_external_pullup(0);
+ if (gpio_is_valid(pdata->ext_pullup_enable_pin))
+ gpio_set_value(pdata->ext_pullup_enable_pin, 0);
+
w1_remove_master_device(master);
gpio_free(pdata->pin);
kfree(master);